12.5 Cycle 17 Calibration Program
The Cycle 17 calibration program continued the testing begun during SMOV. It included long-term programs to monitor the sensitivity and wavelength scale of both the NUV and FUV detectors. Midway through Cycle 17, additional calibration programs were added. Brief descriptions of these monitoring programs are presented in Table 12.2. Table 12.4 lists additional special calibration programs that were undertaken in Cycle 17. A comprehensive review of the Cycle 17 calibration program was published in COS ISR 2012-02 (Osten et al. 2012).
Table 12.4: Cycle 17 Calibration Program.
Program ID | Title | Accuracy Achieved | Products |
---|---|---|---|
12010 | COS FUV Line Spread Function Characterization | Continuum S/N = 9.2 near 1530 Å | COS ISR 2009-01, |
12052 | COS NUV Grating Efficiency Test | Few percent uncertainty in count-rate ratios | Calibration Workshop paper, ISR |
12080 | G140L Focus Sweep | 30% uncertainty in autocorrelation FWHM of spectra | ISR |
12081 | COS Flux Calibration Below 1150 Å with G140L/1280 | 3% for 900–1150 Å, | ISR, Reference file |
12082 | Extending COS/ G130M Coverage Down to 905 Å with Two New Central Wavelengths | wavelength scale: ±0.5 Å, | ISR, Reference file |
12083 | G140L/1280 Wavecal Template | N/A | Reference file |
12084 | G140L/1280 Internal-to-External Wavelength Scales | 7.5–12.5 pixel wavelength zero-point accuracy | Reference file |
12085 | STIS/E230M Data to Determine Internal-to-External Offsets in COS/G230L | Not evaluated yet | Reference file |
12086 | Generation of 1-D Fixed-Pattern Templates | 2% | Reference file, ISR |
12096 | COS FUV Detector Lifetime Position Test | min S/N per resel of 30 at λcen | ISR |
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COS Instrument Handbook
- Acknowledgments
- Chapter 1: An Introduction to COS
-
Chapter 2: Special Considerations when Observing with COS
- • 2.1 COS FUV Detector Lifetime Positions
- • 2.2 Visit Length
- • 2.3 Central Wavelength Settings Added in Cycle 26
- • 2.4 ORIENT constraints for Extended Sources
- • 2.5 COS Observations Below 1150 Angstroms: Resolution and Wavelength Calibration Issues
- • 2.6 Time-Dependent Sensitivity Changes
- • 2.7 Spectroscopic Use of the Bright Object Aperture
- • 2.8 Non-Optimal Observing Scenarios
- • 2.9 NUV Spectroscopic Acquisitions
- • 2.10 SNAP, TOO, and Unpredictable Source Programs with COS
- • 2.11 Choosing between COS and STIS
- Chapter 3: Description and Performance of the COS Optics
- Chapter 4: Description and Performance of the COS Detectors
-
Chapter 5: Spectroscopy with COS
- • 5.1 The Capabilities of COS
- • 5.2 TIME-TAG vs. ACCUM Mode
- • 5.3 Valid Exposure Times
- • 5.4 Estimating the BUFFER-TIME in TIME-TAG Mode
- • 5.5 Spanning the Gap with Multiple CENWAVE Settings
- • 5.6 FUV Single-Segment Observations
- • 5.7 Internal Wavelength Calibration Exposures
- • 5.8 Fixed-Pattern Noise
- • 5.9 COS Spectroscopy of Extended Sources
- • 5.10 Wavelength Settings and Ranges
- • 5.11 Spectroscopy with Available but Unsupported Settings
- Chapter 6: Imaging with COS
- Chapter 7: Exposure-Time Calculator - ETC
-
Chapter 8: Target Acquisitions
- • 8.1 Introduction
- • 8.2 Target Acquisition Overview
- • 8.3 ACQ SEARCH Acquisition Mode
- • 8.4 ACQ IMAGE Acquisition Mode
- • 8.5 ACQ PEAKXD Acquisition Mode
- • 8.6 ACQ PEAKD Acquisition Mode
- • 8.7 Exposure Times
- • 8.8 Centering Accuracy and Data Quality
- • 8.9 Recommended Parameters for all COS TA Modes
- • 8.10 Special Cases
- Chapter 9: Scheduling Observations
- Chapter 10: Bright-Object Protection
- Chapter 11: Data Products and Data Reduction
-
Chapter 12: The COS Calibration Program
- • 12.1 Introduction
- • 12.2 Ground Testing and Calibration
- • 12.3 SMOV4 Testing and Calibration
- • 12.4 COS Monitoring Programs
- • 12.5 Cycle 17 Calibration Program
- • 12.6 Cycle 18 Calibration Program
- • 12.7 Cycle 19 Calibration Program
- • 12.8 Cycle 20 Calibration Program
- • 12.9 Cycle 21 Calibration Program
- • 12.10 Cycle 22 Calibration Program
- • 12.11 Cycle 23 Calibration Program
- • 12.12 Cycle 24 Calibration Program
- • 12.13 Cycle 25 Calibration Program
- • 12.14 Cycle 26 Calibration Program
- • 12.15 Cycle 27 Calibration Program
- • 12.16 Cycle 28 Calibration Program
- • 12.17 Cycle 29 Calibration Program
- Chapter 13: Spectroscopic Reference Material
- • Glossary